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The McMillan Calculator provides your optimal training paces and your equivalent race performances for your current fitness and your race goal. McMillan PRO runkit takes things to the next level. PRO runkit unlocks our advanced calculators (heat adjustment calculator, heart rate training calculator, etc.) and provides the workouts we recommend based on your current fitness and your goal. PRO runkit also offers coaching and training advice via Coach Greg videos and you get access to our running form and core training routines. For a nominal fee, you get access to key ingredients that help you plan and implement your training for success.